Polisher



Jan. 17, 1933. H. E. WIEDMANN POLISHER Filed Dec. 5. 1930 FIG. 2.

F i G.

FIG. 3.

FIG. 5

Patented Jan. 17, 1933 UNITED STATES HENRY E. WIEDMANN, OF SAN FRANCISCO, CALIFORNIA POLISHER Application filed December a, 1930. Serial No. 500,507.

This invention relates to improvements in polishers and more particularly to pollshers and honers for pivots of horological and similar instruments.

The principal object of the invention is to automatically maintain precision in the shape and size and to eliminate risk of breakage of delicate pivots during the polishing operation.

Another object is to prevent undue friction of the polisher against the work.

Another object is to place the polishing member against the lower side of the work so that the progress of the polishing operation may be readily observed by the operator.

A further object is to permit inspection or removal of the work without readjustment of the polisher.

In this. description and the accompanying drawing, the invention is disclosed in its preferred form; but it is to be understood that it is not limited to this form because it may be embodied in other forms. It is also to be understood that in and by the claims following the description it is desired to cover the invention in whatsoever form it may be embodied.

. In the accompanying one sheet of drawmg:

Fig. 1 is a side elevation partly in section showing one form of the invention applied to a conventional watchmakers lathe.

Fig. 2 is a front elevation of the same.

Fig. 3 is a detail view in front elevation of one form of watch pivot being polished in accordance with this invention.

Figs. 4 and 5 are similar views of two other forms of watch pivots and the shapes of the polishing members used in conjunction there- I with.

' cured to the bed 1 and is provided with the journals 56 to carry the shaft 7. The usual step pulleys 8 are fixed to the shaft 7 and are adapted to be driven byva belt from a suitable prime'mover.

The spindle stock 9 is mounted on one end 05 of the shaft 7 and carries the chuck 10. Watch wheels and balance pivots are held in the chuck by the jam nut 11 in the usual manner.

The polishing device is substituted for the on conventional tool rest when in use. The tool rest base 12 is slidably mounted on the bed 1 so as to be capable of longitudinal adjustment. The intermediate plate 13 is slidably mounted on the plate 12 and may be lateral- 1y adjusted.

The plates 12 and 13 are locked in their respective adjusted positions by the bolt 14 having the round head 16 which is confined in the groove 17 of the plate 13. The bolt 14 is tightened by the handle 18 threaded on the end thereof. This jams the overlying plaltel 13 and the base plate 12 against the e I The plate 19 is slidably mounted on the interlocking lug 20 ofthe intermediate plate v13. The shim 21 is inserted in the plate 19 alongside'the lug 20'to assure an accurate fit. The shim is held in place by the screw 22 and may be adjusted by the setscrews 2323.

The standard 24 is fixed to one end of the sliding base 19. The polishing bar 25 is fulcrumed on the screw 26 which is threaded in the upper end of the standard 24. The spring 27 encircles the body of the screw and expands between the head of the screw and the polishing bar 25. I The bar thus is adapted to swing laterally against the tension of the spring 27 The setscrews 26'26' are provided in the standard 24 above and below the screw 26 and bear on the bar 25. These permit lateral adjustment of the bar 25 with respect to its vertical plane and maintains the horizontal top plane of the bar at the desired angle to the axis of the pivot 30.

The bar 25 is provided with the extension '28 on the opposite sideof the fulcrum 26.

The weight 29 is adjustably mounted thereon I and its gravity raises the edge of the bar 25 until it contacts the pivot 30 of the watch wheel 31 inserted inthe chuck 10 of the lathe. It is obvious that a spring counterbalance may be substituted for the weight 29. The edge of the polisher 25 maintains its set angle with respect to the watch pivot 30 and remains so during the entire polishing operation. The u ual polishing material is a plied to the working edge of the bar 25, 1f desired.

The invention operates substantially as follows: The lathe is driven through the pulley 8 to rotate the watch wheel pivot 30 in the chuck 10. The plates l2, 13 are ad- 15 justed by loosening the handle 18 to align the ,pplishing member with the watch pivot 30. The: esilie ntmounting of the bar 25 itii ist the spring 27 facilitates the placing th'polisher 25 in position under the pivot Undue friction of the polishing edge .the shoulder 35 of the pivot does not dbc ,as'the bar 25 recedes against the tensioiiiof he spring27. The bares is reciprocated longitudinally a the operator grasping the knob and aniially'nioving the sliding base 19. The lit 29"causes the polisher 25 to bear a" a1iist,th e pivot 30 with a uniform pressure. ressure may be regulated by adjusthient'of the weight along the bar as desired.

Due of thelower corners of the polishing member is chamfered as at When a 'watch pivot of the type shown in Fig. 4 is polished, the position of the polisher 9'1 ;is hovers by removing the screw 20 and reyersig he bar 25 to bring the chainfered ,ediei fgzyagainst the fillet of the watch 0t I '5 shows a beveled watch pivot 30 d and ebar for polishing it. In this case, the :or :nged'ge of the polisher 25 is beveled ear 34" ,toalign with the pivot 30 The "ease as" is provided adjacent the bevel ,to seaton the horizontalp'ortion 36 of the shaftoflthe watch wheel. This effectually reventsthe polisher from slipping off the inclined surface 30 under the pressure of thelweight 29.

Thedevice may be used as a honer or grinder for pivots by distributing an abrasivesubstance along the working edge of the v I lishing member 25. The pivot is then o'ned or lapped by substantially the same 0' ration as for polishing. By this method, pivots ma be effectively straightened or'reduced in 'amet'er. H'avingthus described this invention, what and desire to secure by Letters Pate 'jLIn cqmbination witha lathe, a sliding base having astandard thereon; a counterbalaneed polishing bar on said standard pivoted aralle'llto the axis of the work in like latheiand capable of resilient movement v{ 5 igpngitudi'nally' in respect to said work.

2. In combination with a lathe, a sliding base having a standard thereon and mounted on the bed of said lathe, a counterbalanced bar loosely pivoted on said standard and bearing against the work in said lathe, and resilient means pressing against the side of said bar.

3. In combination with a lathe; a base slidable transversely to the axis of the work in the lathe; a standard fixed on said base; a counterbalanced polishing bar loosely pivoted to said standard, said pivot being parallel to the axis of said work, resilient means pressing said bar against said standard; and projections in vertical alignment above and below said pivot on said standard and abutting the side of said'bar to form an auxiliary fulcrum to permit said bar to resiliently swing longitudinally'of the axis of said work.

4. In combination with a lathe; a base slidable on the lathe bed transverselyto the axis of. the work in the lathe; a standard fixed 

